Year | Value | 2022 | 72.394607799044 | 2021 | 72.411063918343 | 2020 | 73.000011610469 | 2019 | 73.492827797795 | 2018 | 74.471165345242 | 2017 | 74.929519776246 | 2016 | 75.441914496139 | 2015 | 75.745720750101 | 2014 | 76.346518854361 | 2013 | 76.452570872612 | 2012 | 77.004829548382 | 2011 | 76.900290832745 | 2010 | 76.442768721123 | 2009 | 75.956515505427 | 2008 | 76.317176305635 | 2007 | 76.356776661849 | 2006 | 75.647692438711 | 2005 | 74.748698536915 | 2004 | 74.383047461287 | 2003 | 73.672299814601 | 2002 | 71.663487150143 | 2001 | 71.81174504449 | 2000 | 72.379933406009 | 1999 | 72.435158456491 | 1998 | 72.138970799415 | 1997 | 71.731009055543 | 1996 | 70.781494198042 | 1995 | 70.644115844737 | 1994 | 70.405536655318 | 1993 | 70.1457504151 | 1992 | 70.123475556616 | 1991 | 70.147154706518 |
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